Exponents Challenge Question

timer Asked: Aug 17th, 2015

Question description

Suppose your dog has puppies at 2:00 p.m. and you call two friends.  In 20 minutes they each call 2 friends to tell them the news.  In 20 minutes, these friends each call 2 others.  This continues all afternoon.  Assuming that no one calls someone that already knows, how many people will know by 6:00p.m?

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